"Following on from last night's reveal of Ninfia, a new Wii U game has been announced in CoroCoro. This game, Pokémon Scramble U, is due for release this Spring and will contain all 649 current Pokémon. Like the original, it is 4 Player and can feature up to 100 pokémon at a time. It's a download only game"
Haven't played any Rumble games, however I wish they'd have waited till gen VI. It seems weird to announce the new generation of Pokemon then put this thing out. -shrug- Oh well. Fit things into gen V for as long as you can, I suppose.